Valve



'oct 9, 192s. Re. 17,101 1 s. J. N oRDsTRoM VALVE 0 .M L@ .lmlHMIVwLM a, n y N www. f m m ,l s ,2 f f M v f M 4 n wp .wd/MMM, 2 wwf/5% ,l ,o --11 1 1 t u w w f Reissued Oct. 9, 1,928.

PATENT OFFICE.

UNITED 'STATES SVEN JOHAN NORDSTROM, OF

STROM VALVE COMPANY, DELAWARE.

VALVE.

OAKLAND, CALIFOENIA, ASSIGNOR TO MERCO NORD- OF SAN FRANCISCO, CALIFORNIA, A CORIEORALIONl OF REISSUE Original No. 1,634,722, dated July 5, 1927, lSerial No. 115,413, filed June 12, 1926. Application for reissue led August 7, 1928` Serial No. 298,074.

y, in valves, and more particularly to an improvement in plug valves of the type in which lubrication of the bearing or seating surfaces of the valve is effected by Jforcing lubricant under pressure into the Contact joint between the plug and the valve seat in the casing.-

lThe pressure lubrication principle as applied to plug valves has heretofore been largely restricted to the heavier and more expensively constructed plug valves, but since pressure lubrication 'assures a properly lubricated and positively sealed or non-leakable valve,

it has been proposed that this rinciple b e applied to plug valves of the cieapest andl lightest construction, such as are used for gasl and similar service. One of the requirements of this kind of service is that the valve be sealed so as to be non-leakable. To prevent the valve from leaking it 'has been necessary-to lap or grind carefully the bearing or seating surfaces between the plug and its seat. "This, of course, adds to the cost of the valve.

One object of the present invention is to incorporate the pressure lubrication principle in plug valves of the very cheapest and lightestl construction so that these valves may be manufactured even more cheaply than heretofore and yet be properly lubricated and sealed. Another object of the invention is to arrange the lubricating system of the `valve in such manner that the plug may be turned completely round in its seat, that is, through an angle of 360, Without exposing the lubricant under pressure to the fluid passing through the valve. A more specific object of-the invention is to provide a plug valve of this type with a system of lubricating grooves of such arrangement that when the plug is in closed position the grooves on each side of the passageway lthrough the valve seat cooperate to constitute a continuous groove completely surrounding the passageway which may be illed with lubricant under pressure to prevent leakage past the plug. Tothe accomplishment of these objects the invention consists in the improve-:l plug valve more fully described hereinafter and particularly pointed out in the appended claims. j

In the accompanying drawings illustrating the preferred form of the invention,

j produce.

Fig. 1 is a longitudinal section through the improved valve, with the plug in closed position; Fig. 2 is a transverse section taken across the valveshown in Fig. 1, Fig. 3 is a section taken along the line 3 3 of Fig. 1, but with the plug shown in open position; and Figs. 4 and 5 are sections taken along the lines 4-4 and 5*5, respectively, of Fig. 1.

The improved valve as illustrated in the drawings comprises a. body part or casing 10 `having a longitudinal passageway 11 therethrough and a tapered valve seat 12 formed transversely `of the'passageway 11. Seated in the tapered valve seat 12 is atapered plug 14 having a hole 15 adapted to register with the passageway 11 when the valve is open, as shown in Fig. 3. These parts are formed as usual, b ut it will be observed from a consideration of figures that the plug and the casing are of the lightest vand cheapest construction. The side Walls 16 of the casing are made as thin as practicable, and the plug 14 is hollowed out leaving only the relatively thin concentric Walls 17 in its middle part The longitudinal recesses 23 in the valve seat 12 acilitatesreaming the valve seat and so reduce the cost of manufacture. The parts are formed in this manner by casting.

rIhe tapered valve seat 12 extends entirely through the casing 10. The plug 14 is held in the valve seat by means of a collar 18 and a nut 19. The collar 18 bears against a circumferential flange 2O formed on one sidel of the casing and the nut 19 is threaded onto a stem 21 projecting from the smaller end of the plug. The larger end 22 of the plug closes the larger end-of the'tapered opening through the casing. Projectingoutwardly from the'larger end of the plug is a valve stem 24 flattened to accommodate a wrench by which the plug may be manipulated to open and close the valve. It will be observed that this arrangement of parts Aand the means for holding the plug against its seat is of the simplest, and is correspondingly cheap4 to Usually the plug 14 is lapped or ground into its seat in order to' make a tight joint between them. According to-the present invention the necessity for making a tight joint by protracted lapping or grinding isv by means of the present ineliminated, since other.

The means provided by the present invention for lubricating the contact joint between the plug and the valve seat and for sealing this joint'and the passageway through the casing, when the plug is turned to closed position, as shown in Fig. 1, comprises a plurality of longitudinally arranged lubricating grooves formed longitudinally in the bearing surface of the valve seat 12. These grooves are V-shaped in cross-section and are preferably cast in the casing to save the cost of machining. In the illustrated embodiment of the improved valve there are four longitudinal grooves 25 spaced substant-iallyI 90 apart. Each groove is located. adjacent to one of the lateral sides of the passageway 11 through the valve seat. The two longitudinal grooves at either the inlet or outlet side of the passageway constitute what is hereinafter termed a pair of longitudinal grooves. The upper and lower ends of the grooves 25 extend above and below the up# f per side 26 and the lower side 27, respectively,

of the passageway 11. (The use of the'terms upper and lower with respect tovarious parts of the valve is understood to be relative only and refers to the position of the valve as shown in the drawings.) Formed in the bearing surface of thel upper or larger end of vthe plug and on opposite sides thereof are two transverse lubricating grooves 30, nach groove bein substantially 90o in length. And in the gearing surface ofthe lower or smaller end of the plug and on opposite sides thereof are twov transverse lubricating grooves 31, each groove .being substantially 90 in length. These two pairs of transverse vgrooves 30 and31, although arcuate in longit-udinal sect-ion, as shown in Fig.' 5, are regarded as parallel with the hole 15 through the plug.

It will be observed by reference to'Figs. 1 and 2 that the grooves 30 are located above the plane passing through the upper edge 32 of the hole 15 and that the lower grooves 31 are located below the plane passing through the lower edge 33 of the hole 15. The upper edges 34 of the grooves-30 are substantially in the same plane as the upper ends of the longitudinal grooves 25, and the lower edges A35 of the grooves 31 are substantially in the same plane as the lower ends of the longitudinal grooves 25, as clearly shown in Figs. 1

and 2. The two sets-of grooves 30 and 31 are cast in the plug 14 to save the costof machining.

By mea-ns of this arrangement of lubricating grooves the novel mode of operation and the advantages of the improved valve are attained. It is possible to turn the plug through an angle of 360 without exposing a groove or grooves in which there is lubricant under pressure to the fluid `passing through the line. It is possible to seal the passageway through the casing by surrounding the passageway with continuous or closed circuit grooves filled with lubricant under pressure when the plug is in closed position. And it 1s not necessary to accurately lap or grind in the contact joint between the plug and the valve seat because the travel of the` Rlugpast the longitudinal grooves' 25 causes' the plug to take up lubricant land smear it over the valve seat 12, thereby filling the irregularities of the incompletely machine-d surfaces, with the result that the bearing surfaces are effectively lubricated.

When the valve is closed with the `plug turned so'that the hole 15 is arranged transversely of the passageway 11 and the side 17 of the plug closes the opening through the valve seat, the two upper transverse grooves 30 span the upper ends of the two pairs of longitudinal grooves 25 and the lower grooves 31 span the lower ends of the longitudinal grooves 25, thus establishing around each end of theopening through the valve seat a continuous groove adapted to be filled with lubricant under pressure. And

on the other hand, when the valve is open with the plug turned so that the hole 15 is in alinement with the passageway 11, the upper transverse grooves 30 span and bring into communication the upper ends of the two grooves 25 on eachside of the casing, as

.shown vin ig. 4, and the lower transverse grooves 31 span and bring into communicat-ion the lowerA ends of the two grooves 25 on each side.. of the casing, as clearly indicated in .F ig. v5. But in any intermediate position of the. plug, the grooves 30 and 31 can be in effective communication with only't-wo diametrically disposed-,longitudinal grooves 25. The diametrically disposed longitudinal grooves 25 with which the transverse grooves 30 and 31 are in communication while the plug is in its intermediate positions are never exposed to the Huid passing through the line, because the grooves 30 and 31 are arranged parallelly with the hole 15. The other diayInetrically disposed grooves 25, the two with can pass into the lin@ Q r attacked by the the line.

fluid passing through t-he valve. 4Thus by the present construction it is possible to stop the plug at any point in its 360o of rotation and put the lubricant in the grooves under pressure without forcing any of the lubricant into And there is no waste of lubricant, except the relatively small amount which may be dissolved or washed out of the exposed grooves. l u

The means for introducing the lubricant under pressure into the grooves comprises a reservoir consisting of a hol-d 37 formed axially -in the valve stem 24 anda cored hole 38 formed transversely in the upper or larger end of the plug 14 and connecting at its outer ends the two opposite transverse grooves 30, as shown in' Fig. 4.' The hole 37 in the valve stem 24 is threadedto receive a pressure screw 39 b-y which the lubricant in the various connected passageways and grooves is put under pressure.

Having thus described the invention what I claim as new is l. A valve comprising, a casing havingl a longitudinal passageway therethrough and a tapere-d valve seat formed transversely of the-passageway, a tapered plug seated inthe valve seat and having a hole adapted to register with the passageway, means for holding the plug against its seat, the valve seat being provided with four longitudinal grpors spaced substantially 90 L'apart extending above and below, rewectivelyf the planes'- passing through the upper and lower sides of the passageway through the valve seat, the bearing surface of the plug being provided at the larger end of the plug with two transverse grooves lying in the plane passing through the upper ends of the longitudinal grooves and at ythe smaller end lor the plug Vwith two transverse grooves lying in the plane passing through the lower ends of the longitudinal grooves, each pair of transverse grooves being substantially 90o in length and arranged parallel with the hole through the plug, the ends of each pair of transverse grooves being spaced substantially 90 apart, a reservoir in the plug for containing lubricant, connec'tionsbetween the reservoir and one pair of transverse grooves, and means for putting the lubricant in the reservoir under pressure to force it into the grooves.

2. A valve comprising, a casing having a passageway therethrough an-d a tapered valve seat formed transversely of the passageway, a tapered plug seated in the valve seat and having a hole adapted toregister with the passageway, means for holding the plug against its seat, the valve seat being provided on each lateral sideof the passageway therethrough with a longitudinal groove extending at each end beyond the passageway, the seating surface of the plug being pro'- vided with a transverse groove on each side thereof above and below the planesof the upper and lower edges of the hole and parallel with the hole, the upper pair of transverse grooves lying vin the plane passing through the upper ends of the longitudinal grooves and the lower pair of transverse grooves lying in the plane passing through the lower ends of the longitudinal grooves, the transverse grooves being long enough to spa-n and no more two adjacent longitudinal grooves when the plug is in closed and in open position, a reservoir in the plug for containing lubricant connected with one pair of trans? verse grooves,and means for putting the lubricant under pressure to force it into the transverse and longitudinal grooves.

3. A valve comprising, a easing having a passageway therethrough and a tapered `valve seat formed transversely of the passageway, a tapered plug seated in the valve seat and having a hole adapted to register with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form when the plug is in its open and closed positions two diametricall op' posed closed circuit grooves, a reservolr for containing plastic substance, connections between the reservoir and all thegrooves when the plug is in its substantially full and open and closed positions only, and means for putt-ing the plastic subs-tance under pressure.

4. A valve comprising, ay casing having a passageway therethrough and a tapered valve seat formed transversely of thep-assageway, a tapered plug seated in the valve seat and having a -hole adapted to register with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form when the plug is in either its substantially full closed' or open position two. diametrically `opposed closed circuit grooves, and means for'introducing a plastic substance under pressure into the grooves, the longitudinal grooves being so arranged that they are only supplied with lubricant under pressure when they are not exposed to the fluid passing through the valve, but are cut off from the supply'of lubricant under prest sure when they are exposed to the luid passing through the valve. 1

5. A valve comprising, a casing having a passageway there-through and a tapered valve seat formed transversely of `the passageway, a tapered plug seated in the valve seat and having a hole adapted to register with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form a continuous groove surrounding the hole and passageway when the plug is in closed position, and means for introducing a plastic substanceunder pressure into the grooves, Ithe longitudinal grooves beingso arranged that they are only supplied with lubricant under pressure when they are not lubricant under pressure when they are eX- posed to the fluid passing through the valve.

6. A valve comprising, a casing having a passageway therethrough and a valve seat formed transversely of the passageway, a plug seated in the valve seat and having a hole adapted to register with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form when the plug is in its open and closed positions two diametrically opposed closed circuit grooves, a reservoir for containing plastic substance, connections between the reservoir and all the grooves when the plu-g is in `its substantially full open and closed positions only, and means for putting the plastic substance under pressure.

7. A valve comprising, a casing having a passageway therethrough and a valve seat formed transversely of the passageway, a plug seated in the valveseat and having a hole adapted to register -with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form a continuous groove surrounding the hole and passageway when the plug is in closedrposition, and means for introducing a plastic substance un'der pressure into the grooves, the longitudinal grooves being so arranged that they are only supplied with lubricant under pressure when they are not exposed to the fluid passing through the valve, but are cut olf from the supply of lubricant under pressure when they are exposed-to 4the Huid passing through the valve.

SVEN JOHAN NORDSTROM. 

